Adjustable surgical chair



(.N Model.) l

T. J. SHACKELFO ADJUSTABLE SURGICAL CHAIR.

9 Sheets-'Sheet 1.

RD 8u J. P. MILTONBBRGER.

No. 520,579. Y Patented May 29, 1894.`

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(No Model.) v 9 Sheets-#Sheet 2. T. J. SHAGKBLPORD 8v J. P. MILTONBERGER. ADJUSTABLE SURGICAL CHAIR.

No. 529,579 Patented May 29, 1894.

(No Model.) 9 ySheets-Sheet 3.

T. J. SHAGKELPORD 8v J. `l?. MILTUNBERGER.

ADJUSTABLE SURGICAL CHAIR..

N0. 520,579. Patented May 29, 1894.

(No Model.) 9 sheets-sheet 4.

T. J. SHAGKELPORD 8u J. F. MILTONBERGER. ADJUSTABLE SURGICAL 0mm.

No. 529,579.l Patented May 29, 1894.

(No Model.) 9 Sheets-Sheet 5. T. J. SHAGKELFORDSE J. F. MILTONBERGER.

v ADJUSTABLE SURGIGAL CHAIR. No. 520,579. Patented May 29, 1894.

(No Model.) 9 sheets-sheet e.

T. J. SHACKBLFORD & J. F. MILTONBERGER. ADJUSTABLE SURGICAL CHAIR..

No. 520,579. Patented May 29, 1894.

(No Model.) 9 Sheets-#Sheet 7.

T. J. SHACKBLFORD 8: J. F. MILTONBERGER.

* ADJUSTABLE SURGICAL GHAIR.

Patented May 29, 1894.

6% umn 6g if @a MINIMUM"lffffi.. AUAUAHAW@ ff. MIAG r (No Model.) 9Y Sheets-sheet s.

T. J. SHACKELFORD & J. P. MILTONBERGER. ADJUSTABLE SURGICAL CHAIR.

No. 529,579. Patented May 29,1894.

lll/lll,

(No Model.) 9 Sheets-Sheet 9.

T. J. SHACKELFORD & J. P.r MILTONBERGER. ADJUSTABLE SURGICAL GEAIR.

No. 520,579. Patented May 29, 1894.

UNITE STATES ATENT Ii Fries.

f TIFFIN J. SHAOKELFORD AND JOI-IN F. MILTONBERGER, OF WARSAW,

INDIANA.

ADJUSTABLE SURGICAL CHAIR.

SPECIFICATION forming part of Letters Patent No. 520,579, dated May 29, 189 1.

I Application tiled November 24, 1893. Serial No. 491,886. (No model.)

To a/ZZ whom t may concern:

Be it known that we, TIFFIN J. SHAGKEL- FORD and JOHN F. MILTONBERGER, citizens of the United States, residing at Warsaw, in the county of Kosciusko and State of Indiana, have invented certain new and useful vImprovements in Adjustable Surgical Chairs, of which the following is a full, clear, and exact description, that will enable others to make vand use the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention'relates to improvements in that class of adjustable chairs that are more especially intended for use in the medical profession, and has for its object to provide a structure of this character that will embody all the features, convertible positions and combinations required either by the special or general practitioner.

` A further object has been to so construct and arrange the different parts, both as to the general features and details, that the structure can be quickly and conveniently converted into any of the changeable positions, or combination of positions, or angles while the patient is in the chair.

The adjusting and controlling mechanism is so arranged that the different parts may be securely held at any angle or combination of angles without the least danger. No matter what convertible position the chair is in, it may be freely turned in either direction to obtain a better light or for other purposes. The structure is capable of being converted into many diderent positions, from that of an easy chair to an extended horizontal position forming a table or couch, or any inclined position. The different positions are not illustrated, as too many drawings would be required. The mechanism employed to effect the many changes is however fully shown.

Figure l is a side elevation of a chair-structure embodying our improved features; Fig. 2, a front elevation; Fig. 3, a vertical longitudinal section on line 3, Fig. 2, looking in the direction indicated by the arrow; Fig. 4, a vertical transverse section on line 4, Fig.A 3; Fig. 5, a horizontal section on line 5, Fig. 3; Fig. 6, a plan of the supporting base; the pivline 12, Fig. l0; Fig. 13, a detached detail; Fig.l

14 a diagrammatic View, part plan and part section, of details of construction; Fig. 15, a

broken-away longitudinal section on Yline'15, i

Fig.- 2; Fig. 16, a broken-away elevation showing the hinged connection between the chairvframe Aand leg-rest frame; Fig. 17, a detached View of the under side of the foot-stirrup adjusting-bar; Fig. 18 a perspective of one of the stirrups; Fig. 19, abroken-away vertical transverse section on line 19, Fig. 15; Fig. 20, a plan of the thumb-plate shown in Fig. 19; the locking-bolt being in section; Fig. .21,V a View in perspective of plate connections'between the 1egrest frame and the foot-rest; Fig. 22, a perspective of a link used in connection with the plates shown in Fig. 2l for adjustabiy joining .the leg-frame'and foot-rest parts; Fig. 23, a broken-away section on' line 23, Fig. 24, showing the junction of the back-frame with the bars of the chair-seat frame, looking outwardly from the inside; the cap-plate on that side being removed to show the arrangement of vthe adjusting and lockingmechanism; Fig. 24, a horizontal section on line 24, Fig. 23, showing both sides of the chair-scat frame; Fig. 25, a broken-away section on line 25, Fig. 2G, showing the mechanism used in locking the chair at different elevations; and Fig. 26, a horizontalsection on line 26, Fig. 25, showing both sides of the chair frame.

In the drawings, A represents a separable supporting-base or pedestal, B the chairframe, C the chair-seat frame, AD the back, and E a stationary pivot and guide-post, on which the chair y is raised, lowered and rotated.

The base is provided with a downward extension or depression 2 (Figs. 1, 2, 3, 4 and 6) having the central raised hub 3 and the sur- IOO rounding recess or chamber 4. The lower part of pivot-post E has a shoulder-stop formed thereon, which rests on the top of hub 3. The lower end of the post extends through to the under side of this hub, and is locked rigidly in place by a clamping-nut 6. An annular lift-plate 7 is loosely mounted on the pivot-post and when the chair is in its lowermost position, (as illustrated) this plate rests on the top of hub 3. The upper ends of two companion lift-rods 8 are iixed in the liftingplate 7, and the lower ends rigidly secured in the respective ends of cross-bar 9, on which is loosely mounted a friction-roller 10, which normally rests on the inner curved end (Figs. 1 and 3) of a lifting or foot-lever ll. This lever is provided near its longitudinal center with the fulcrum-bearing 12, and extends outwardly to a convenient position at the rear side of the base. The foot or treadle end of this lever is in two parts or sections and joined together by a pivotbearing 13, so

, that the outer or foot-part may be folded over and shortened so as to be out of the way when notin use, as shown in Fig. 3.

A cross-bar 14 has its respective ends secured to the lower part of the chair-frame and is provided centrally with a bearing-collar 15 looselyembracing the pivot-post. This collar seats loosely on lifting-plate 7, so that the cha-ir may be freely'revolved in either direction without reference to the elevating mechanism; collar 15 having both a rotary and vertical movement on the pivot-post. A second cross-bar 16 also has its ends secured in the respective sides of the chair-frame at the top and provided with a guide-sleeve 17 inclosing the Lipper part of pivot-post E, which is provided with a number of annular grooves 18 for the engagement of pinionwheel 19 through openings 2O in said sleeve. This pinion-'wheelis rigidly mounted on shaft 21 having its ends (Figs. 3, 7, 25 and 26) journaled in the respective sides of the chairframe. 0n the ends of shaft 2l are mounted ratchet-wheels 22 and 23. A rod 24 runs parallel with shaft 2l and projects through the frame of the chair at each side, and has thumb-plates 25 and 26 mounted on the respective ends thereof. On this rod and just inside of the frame are mounted pawls 27 and 28; the loose ends of which are held normally in engagement with ratchet-wheels 22 and 23, by means of spring a, Fig. 26. When pressure is applied to the foot-lever the chair is elevated through the medium of rods 8, their cross-bar, the plate, in which the upper ends of said rod are fixed, and the cross-bar and collar resting on the .lifting-plate. The upper cross-bar and its guide-sleeve, inclosing the 4grooved end of the pivot-post, greatly assist in maintaining and supporting the chair in a central position.- roller bearing on the innervupper curved side of the footflever lessens the power required in raising the chair-by easing the movement of these parts. The pawls engaging with the The friction? ratchet-wheels on shaft 21, lock the chair at any height to which it is capable of being l elevated when the pressure on the foot-lever is relaxed. By pressing on either one of the thumb-plates 25 and 26 the pawls are disengaged from their ratchet-wheels, thus permitting the chair to be lowered.

In one corner of the base (Figs. 6 and 9) is located a vertical locking-bolt 29, the upper end of which engages with recess 30 (Fig. 9) in the under side and corner of the chairframe. A spiral spring 31 holds said bolt in its normal locking position and locks the chair against being rotated when resting on the base. Thisboltonlylocksthechairfromturning when in its lowermost position, as when the chair is elevated at any point above the base it may be revolved freely in either direction. The lower end of bolt 29 is provided with a foot-plate 32; a slight pressure on this plate retracts the bolt and releases it from .a locking position so that the chair may also be turned around when resting on its base. y

The chair is locked against turning when in an elevated position by means ofa locking screw-rod 33 (Figs. 3 and 5) inserted through a threaded bearing 34 fixed to the chair-frame. The inner end of this screw-rod passes through bearing-collar 15 and bears against pivot-post E when in a locking position. The outer end of this screw-rod has a handle, 35, mounted thereon, which provides a means for rotating the same.

To the under side of the seat-frame (Figs. 3 and 10) is attached a plate, 36, provided with lugs, 37, between which is pivoted the upper fiat end of a brace-rod 38, as at 39. A lug, 40, projects down from the flat end of this brace to which the upper end of guidebar 4l is pivoted, thus providing a common IOO pivotal connection for these parts with reference to the seat-frame. A cross-barV 42 has its respective ends secured to the upper part of the chair-frame (Figs. 3, 7 and 10) and is provided with two projecting guide-lugs, 43 and 44, which loosely embracethe edges of guide-bar 41 and prevent a lateral movement thereof. The lower inner end of a curved radius-rod, 45, is rigidly secured to guide-barl locked at any point by means' of screw-bolt 49A clamping the curved rod 45. The lower undetached part of guide-bar 4l is provided with a curved slot 50 (F`ig.3) and'extendsdown between the Vtwo parts of a'bifurcated guide-bracket, 5l, rigidly secured tothe lower front cross-bar 52 of the'ch'airframe'.- 'A fric-` tion-roller 53 is journaled in said bracket and engages with the curved slot in guide-bar 41, to ease and facilitate the longitudinal tilting movement of the`chair in elevating the feet and lowering the head, or the opposite, and also to provide for the rocking or pumping action sometimes required when administering an ansthetic. normal position the lower slotted end of guidebar 4l extends down into recess or chamber 4 (Fig. 3) in the base out of the Way, so as not to interfere with the turning of the chair. A sleeve 54 (Fig. lO) has one end secured in bracket 51 and incloses one end of locking-rod 55, which engages with any one of the series of apertures 56, in the lower part of guide-bar 41, and locks the chair at any point in accordance with the degree of inclination required. A spring 57 is coiled around locking-rod 55 inside of the sleeve 54 and automatically holds the rod in a locked position. The opposite end of rod 55 is pivoted to the lower end oflever 58, as shown in Fig. lO. This lever is provided with fulcrum-bearing 59, in lug 60 secured to the chair-frame. The upper end of lever 58 is attached to the inner end of a hand-stem 61'; the connection being such that when said stem is pushed inwardly a corresponding movement is imparted to the s joining end of the lever, and also providing for a rotary movement, or a partial turning around of said stem. Aplate 62 (Fig. 13) is fastened to the outer side of the frame (Fig. 10) and is provided with aperture 63 through which stem 61 is inserted and extends on through the chair-frame, as shown. A lug 64 (Fig. 12) is formed on stem 61, which, when these parts are in their normal position engages with a notch, 65, in plate 62; the locking-ro'd being engaged with guide-bar 41.

` Pushing in on stem 61 has the effect of retracting rod 55 from its locking engagement in the guide-bar 41, and then slightly turning the stem, in either direction, lug 64 is thrown out of line Awith reference to notch 65 and bears against the inner side of plate 62 and holds rod 55 in its unlocked position, permitting the chair to be freely rocked-longitudinally. When it is desired to simply change the longitudinal inclination of the chair, a degree'more or less, stem 6l need not, ordinarily, be rotated after boing pushed in but held in that position momentarily, the position of the chair changed and the pressure relaxed on stem 6l, when rod 55 will be thrown into alocking engagement byits spring. The rear part of the chair-seat also has a supporting pivot, imparting a universal joint action both with reference to the lateral and longitudinal tilting movement; the arrangement being as follows: 1

A cross-bar 66 (Figs. l and 3) is secured to the under side of the seat-frame. This bar is provided, near its longitudinal center, with downwardly projecting lugs 67. The journal or pivot-bearings 68 and 69 (Figs. 1, 3 and 7) are secured to the respective edges of the rear vrocking pivot-pin 7l is When the chair is in its` jcoiled on rod 84, inside of its upper cross-bar 70 ofthe chair-frame. A

journaled in said pivot-bearings and is provided with the up- Wardly projecting lug 72, which is pivoted between lugs 67 formed on cross-bar 66, as shown.

The leg-rest, foot-rest, and stirrup attachments will next be described. The leg-rest frame, 73, is hinged, as at 74, (Figs. 1, 15 and 16) to the front end. of the seat-frame so that it may be raised or lowered as required. A transverse bar (Fig. 14) is secured to the under side of the seat-frame and has one end of a tube, 76, pivoted to the longitudinal center thereof, as at 77. A plate 78, provided with lugs 79, is secured to the under side and lower part of leg-rest. A rack-bar is pivoted at one end to plate 78 and extends into tube 76 and is adapted to have a longitudinal movement therein. The part 8l of anglesleeve 82, (Fig. 14) embraces the lower end `of tube 76; the part 83, extending off at right-angles, incloses the inner end of a handlocking-rod 84, which engages with ratchetteeth in rack-bar 80. A spiral-spring 86,

mally retains said rod in its locking position.

'By this arrangement the leg-rest may be adjusted to any angle or position within the limit f of its movement. The leg-rest may be raised to any point without disengaging its lockingrod, but the same must be retracted when lowering it. The foot-rest 87 has a hinged or pivoted connection with the leg-rest and forms an extension thereof and is capable of being adjusted at right-angles thereto or extended in the same plane therewith. The means employed to accomplish this adjustment consists of two hinge-platesj88 (Figs. l and 21) secured to the ends of the leg-rest, and the two hinge-plates, 89, secured to the ends of the foot-rest. Theplates 88 and 89 are pivoted together on the line between the leg and foot-rest, as shown at 90, thus providing for the hinge-joint action required. The plates 88 are provided with a slot 91 termiuating at the upper end in an angle-recess 92. The upper end of an adjustable connecting-link 93 (Fig. 22) has a headed guide-pin, 94, inserted therein; the head-end being on the inside of plates 88 and projecting out through the slot therein, there beingv space enough between the head of pin 94 and links 93 to receive the edge of plates 88. The lower end of connecting link or links 93 are pivoted to the respective ends of the foot-rest, as at 95. When the foot-rest is in its right-angle position (Fig. l) with reference to the leg-rest,the guide-pins 94 of links 93 rest in the angle-recess 92 and lock the foot-rest in that position. Bypressingon the underside of the links, close up to the upperends, the guide-pins are disengaged from theirlocking position and will move down the slots in plates 88, allowing the footrest to be lowered to its extended position;

the links extending parallel with reference to the` leg and foot-rest parts- The side rails 48 and 96, of the seat-frame, are provided, lonsleeve part, nor- IOO IIC

gitudinally, with passages 97, (Figs. 15 `and 16) for the reception of companion rack-bars 98 and 99 4(Fig. 17) having an endwise movement therein. The projecting head-ends of these bars are ,provided with a cross-bar 100 having apertures 101 and 102 in the respective ends thereof. The stirrirps 103 and 104 (Figs. 2 vand 18) are each provided .with an attaching stem 105, which is adapted to be inserted in 'theapertu-res in the cross-bar 100; the clamping-screws, 106, holding the sti-rrups in any position or elevation to which they are adjusted. The rack-bars 98 and 99 are provid-ed with teeth 107, with which the inner end of locking-bolt, yor bolts, 108 engages. A spring 109 coiled on said bolt, or bolts, holds thefsame inengagementwith lthe. toothededge of the stirrup rack-bars. r-1`he thumb-plate 110, attached tothe proj ectingend of lockingbolts 108, affords ,means for retracting the same when the rack-bars are-to be drawn outward. By having amore than oneaperture in the cross-.bar or head-end of th-e rack-bars, the stirrnps .may be set nearer to or 4farther apart as circumstances may require. By means-of -the longitudinal adjustment of the rack-bars the relative distance :between tthe chair-seat .and stirrups may also be changed as required.

Themechanism employed in the .adjust-l ment of the lback of the chair, with reference to the seat vwill .next be described.

The rear inner sides of the seat-frame are cutaway (Fig. 24) to receive the box-plates 111, Arigidly secured in place. vTo therespective Elower ends of the4 back standards 112 and 113., -is secured a pivot-plate 114, having .t-he rounded projecting end (Fig. 23) extending linto the box-plates from :the rear ond and mounted on pivot-shaft 115. The rounded part of the plate, or plates, 114 is provided with -a number of teeth, 116, with which one endo-f pawl 117 engages. r1`he vopposite end of pawl 117 rests on a tripping-finger 118, rigidly mounted on the rock-shaft 119 projecting through at one side, and. has the thumb-plate 120 mounted thereon.' A spring 121 is connected with pawls 117 4and normally holds them in an engaged position. When lowering the back of the chair, the pawls are thrown out of engagement by slightly turning rock-shaft 1l9by means of its thumb-plate. The pawls, tripping-fingers, and springs are located inside of .the boxplates 111, which are closed by removable capplates 122. The rear vends of the iside-rails are rounded -as at 123 (Figs. land 3) and :provided on the upper side with stop-shoulder 124 andl on the lower vside with stop-shoulder 125. The joining surface of the chair-back is correspondingly curved out to form a closev fit-ting bearing, as shown at 126, and when adjusted to the highest or lowest position, shoulders 124 and 125 form a dead-stop and strengthen the structure.

By means of the mechanism described, the chair-back may be adjusted to any angle between its vertical and horizontal position. rPhe rearends of chair-arms 1f27`and 128 are hinged to :the back standards,.assho-w-nfat 129 Figs. 1 and 3. The front part of the ychairarms are connected with and supported 'tfrom the side'railslof the seat-frame by bars 130, having their ends pivoted :to the chair-arms land seat-frame respectively, so that lthese parts will conform to any position the chai-rback is icapable of beingadj usted to.

A leaf 131 is hinged,.as at 132, to the chairarms and adapted lto ybe turned outwardly to the vposition shown -in Fig. 4, forminga small, convenient table extension ,to ibe lused more especially when operati'ngon the hand or arm. When yclosedor ,folded vback to their normal position, these leaves form ksubstantiallj7 a` part kof the chair-arms, and vare upholstered asshown; y

A drawer 133,(Figs. 2 and 3) is linserted in the seat-frame from the fron-t side, .and is within convenient reach ot' :the operatorwhen seated in front-.of lthe chair. .This'drawenmay be used asa convenient receptablefforlinstruments, or drawn Aout Aand used as an additional sholf-supporuor for various other y,pu-rposes.

The chair-frame is provided at ione side (Figs. 1, 4, 7 and 8) -with a czuspidor receptacle'134, and on 'the opposite side with a medicine case 135. `These receptacles have both a slidingand aswingifngfmovement; the arrangement being as follows: Two hingerods 136 and 137 are'supported by, and `have a longitudinal :movement inlbea-rings 138 and 139 rigidlysecured to the chair-frame. The receptacles are mounted on the outerendsof these rods, as shown :at 140, the inner end having `a stop-pin 141 inserted therethrough (,Fig. 8) whichlimits theiroutwardmovement and prevents the rods from .becoming ,disengaged from -their bearings. These rods are provided with .pivot or hinge-joints 142, so that the receptacles carried thereon maybe s-wung around at right-angles to a convenient position when drawn out far enough to clear the chair-frame, as shown in Fig. 7.

We do not limit ourselves to the precise detailsof construction and arrangement shown, but may make such changes as will'ordinarifly come within the province of the-mechanic, without departing from the spirit of our invention.

Having thus described your invention, what we 4claim as new, and desire to secure by Letters Patent, is-

1. In a convertible chair, a base-structure, a hub-part, a pivot-post, provided in its `upper part with a number of annular grooves and having its lower end inserted down through said hub or base and rigidly fixed therein, a lifting-plate, loosely Vmounted on the pivot-post, the companion` lift-rods, having their upper endsy fixed in the'rliftsplate, a cross-bar, connecting the klower ends of said rods, a foot-lever, fulcrumed' inrthe basestructure, the chair part, resting on and ele- IOO IIO

vated by the lift-plate and operating-mechanism, and the means described, sustaining the chair in an elevated position, substantially as set forth.

2. In a convertible chair, the combination with the chair part propel', of a base-structure, a lifting foot-lever, fulcrumed therein, a cross-bar, a friction-roller, loosely mounted thereon, the lift-rods, having their lower ends fixed in the respective ends of said cross-bar, a'lift-plate, in which the upper ends of said rods are fixed, a pivot or guide-post, and the means described for sustaining the chair in an elevated position, substantially as set forth.

3. In a convertible chair, the combination with the chair part proper, of a base-structure, a pivot or guide-post, fixed therein, a lift-plate loosely embracing said post, the companion lift-rods, having their upper ends fixed in the lift-plate, a cross-bar, connecting the lower ends of the lift-rods, a friction-roller, loosely mounted on said bar, a foot-lever, provided with a suitable fulcrum-bearing, the inner end presenting a curved surface to said roller and the outerend having a pivotal joint and folding over upon itself, and the means described for sustaining the chair in an elevated position, substantially as set forth.

'4. In a convertible chair, a supporting-base, a pivot-post, having its lower end fixed in said base, the chair frame, a cross-bar, secured to the chair-frame and provided centrally with a collar loosely embracing the pivot-post, a lift-plate, the lift-rods, the cross-bar, connectf ing the lower ends of said rods, a lifting footlever, and the means described for sustaining the chairin an elevated-position, substantially as set forth.

5. In a convertible chair, a pivot-post, having a fixed position and provided with a number of annular grooves, the chair-frame, a cross-bar, having its respective ends secured to the chair-frame and provided centrally with a guide-sleeve, loosely inclosing the grooved part of the pivot-post, a shaft, journaled in the chair-frame, a pinion wheel, mounted on said shaft and adapted to engage with lthe grooves in the pivotpost through an opening in said sleeve, ratchetwheels, mounted on the respective ends of the pinion-shaft, a rod, running parallel to said shaft, the pawls, mounted on said rod and'fengaging with said ratchet-wheels, and means for rotating said rod for the purpose of throwing the pawl out of engagement, whereby the chair-structure may be locked at any elevation above the base, substantially as set forth.

6. In a convertible chair, the combination of a supporting base, a pivot-post, provided with annular grooves for a part of its length and rigidly secured in the hub-part of said base, a lift-plate, embracing the pivot-post, the rods, extended up through the base and having their upper ends fixed in the lift-plate,

a crossbar, connecting the lower ends of said rods, a lifting or foot-lever, the chair-frame, a cross-bar, secured to the lower part of the chair-frame and provided centrally with a collar loosely inclosingsaid pivot-post, acrossbar, secured to the upper part of said frame and provided centrally with a guide-sleeve, loosely inclosing the grooved part of the pivot-post, a shaft, journaled in the chair-frame, a pinion-wheel, mounted on said shaft and adapted to engage with the grooved part of the pivot post, ratchetwheels, mounted on the respective ends of the pinion-shaft, a rotatable rod, running parallel to said shaft, the

pawls, mounted on said rod and engaging with said ratchet-wheels, whereby the chair may beraised and locked at any elevation, lowered, and revolved at any point between the lowest and highest position, substantially as set forth.

7. In a convertible-chair, the combination of the chair-frame, the seat-frame, the rear pivotal connection, joining the chair and seat frames, a guide-bar, pivoted at its upper end to the under side of the seat-frame, a curved rod, having one end secured to said guide-bar, a sleeve, fixed in the seat-frame and provided on one end with a guide-lug through which the undetached end of said curved rod is inserted, a clamping-screw, having a threaded engagement in said sleeve and bearing against said rod, whereby the seat-frame may be tilted laterally and locked at any angle, substantially as set forth.

8. In a convertible chair, the combination of the chair-frame, the seat-frame, the pivotal connection, joining the chair and seatframe at the rear, a brace-rod, pivoted at its inner end to the front of the seat-frame, a guide-bar, pivoted at its upper rend to a lug formed on said brace-rod, a curved radiusrod, to which the outer end of said brace-rod is secured, and means, substantially as described, for locking the seat-frame with reference to said curved rod,'substantially as set forth.

9. In a convertible chair, the combination of the chair-frame, the seat-frame, the rear pivotal connection, joining the chair and seatframes, a guide-bar, having a pivotal connection with the front part of the seat-frame, a cross-bar, having its respective ends secured to the chair-frame and provided with guidelugs which loosely embrace the edges of the guide-bar, a guide-bracket, rigidly secured to the chair-frame, a curved radius-rod, secured at its lower end to the guide-bar, the upper end extending up through one side of the seat-frame, a clamping-screw, engaging with the radius-rod, a brace-rod, and means, substantially as described, for locking said guide-bar in any position to which it is capable of being adjusted, substantially as set forth.

10. Ina convertible-chair, the combination of the chair-frame, the seat-frame, the rear pivotal connection joining the chair and seat IOO frame, a guide-bar, pivoted at its upper end to the under side and :front part of the seatframe and provided in its lower end with a curved slot, a guide-bracket secured to the chair-frame, a friction-roller, journaled in said bracket and Working in the slotted end of said guide-bar, and the locking-rod, adapted to engage with the guide-bar, whereby the chair part may be rocked longitudinally, substantially as set forth.

11. In a convertible-chair, the combination of the tilting seat-frame, a guide-bar, pivoted at its upper end to said seat-frame, the lower end being slotted and provided with a series of apertures, the chair-frame, a bifurcated bracket, rigidly secured to the lower part of the chair-frame and guiding the movement 0f said guide-bar, a friction-roller, journaled in saidbracket and engaging with the slotted part of the guide-bar, a sleeve, secured in said bracket, a locking-rod, extending in through said sleeve and adapted to engage with the apertures in the guide-bar, a lever, provided with a fulcrum-bearing in the chairframe and connected at one end to the outer end of -the locking-rod, and a stem, connected t'o'one endvof the fnlcrumed lever, whereby said locking-rod may be thrown into and out of engagement with reference to the guidebar in adjusting the chair, substantially as set forth.

12. In a convertible-chair, the combination of the chair-frame, the seat-frame, the pivotal connection, joining the chair and seat frame at the rear,a guide-bar, having apertures in the lower part thereof and pivoted at its upper end to the seat-frame, a bifurcated bracket, .rigidly secured to the chair-frame and loosely embracing thelower end of said guidebar, a friction-roller, j ou rnaled insaid bracket and engaging with the slotted end of said guide-bar, a sleeve, secured in said bracket, a locking-rod, inserted through said sleeve and engaging with the apertures in the guide' bar, and a spring inclosed by said sleeve and coiled on the rod passing therethrough, whereby the latter is held normally in a locked position, substantially as set forth.

13. In a convertible-chair, the combination of the chair-frame, the seat-frame, the pivotalconnection, joining the chair and seat frame, a plate, secured to the Ychair-frame and provided with an aperture, and a notch opening into said aperture, a hand-stem, inserted through the chair-frame and plate and provided with la lug adapted to engage with the notch in said plate in one position, a fulcrumedlever, to one end of which said handstein is connected, a locking-rod, connected at one end to the opposite end of said lever,

a bifurcated bracket, rigidly secured to the chair-frame, a sleeve, inserted in said bracket, a spring, coiled on said locking-rod inside of said sleeve, a guide-bar, pivoted at its upper end to the `seat-frame and provided in the lower part, loosely embraced by said bracket,

with a number of apertures with which the inner end of the locking-rod is adapted to engage in locking said guide-bar in the different positions to which it. is capable of being adjusted, and a friction-roller, journaled in said bracket and engaging with the slotted end of the guide-bar, substantially as set forth.

14E. In a convertible-chair, the combination of the seat-frame, a cross-bar, provided with projecting lugs and secured to said frame, the chair-frame, the journal or pivot-bearings, secured thereto, a rocking pivot-pin, journ'aled in said bearings and provided with a lug piv otally connecting with the lugs on the crossbar secured to the seat-frame, a guide-bar, pivoted at its upper end to the underside and front part of the seatframe,a `curved rod, having one end secured to said guide-bar, a sleeve, fixed in the seat-frame and provided on one end with a .guide-lug through which the undetached end of said curved rod is inserted, a clamping-screw, having a threaded engagement in said sleeve and bearing against said curved rod, a bifurcated bracket, rigidly secured to the chair-frame and looselyembracing the lower part of the guide-bar, and means, substantially as described, for locking said bar in place with reference tosaid bracket whereby the seat-frame may be tilted laterally and longitudinally, and locked at any angle, substantially as set forth.

15. In a convertible chair, the combination of the seat-frame, the leg-rest, hinged thereto, a tube, pivoted at one end to said frame, a

,rack-bar, pivoted at one end to the leg-rest and extending into the tubular connectionof the seat-frame, an angle-sleeve, embracing one end of said tube, a hand locking-rod, inserted through the angle-part of said sleeve and engaging with said rack-bar, and aspring, coiled on said rod and normally holding the same in a locked position, substantially as and for the purpose set forth. U

16. In a convertible-chair, the combination of the seat-fram e, the leg-rest, having a hinged connection therewith, a transverse-bar, secured to the under side of the seat-frame, a tube, pivoted at one end to said bar, .a rackbar, pivoted at one end to the leg-,rest .and loosely inserted in said tube, an angle-sleeve, embracing one end of said tube, a lockingrod, inserted through said sleeve and bearing against the rack-bar, the hinged-plates, provided with slots ending in angular recesses and secured to the leg-rest, the foot-rest Vextension, the `hinged connection, joining the legand foot rest, and the connecting links, pivoted at one end to the respective ends of the foot-rest, the opposite ends `of said lin-ks adj ustably engaging with the ,slotted plates of the leg-rest, substantially as set forth.

17. In a convertible chair, the combination with the side rails of the seat-frame, of the companion box-plates,theback-standardathe ICO IIO

pivot-plates, secured to said standards and said pawls in their engaged posit-ion,substan having rounded toothed ends projecting into tially as set forth.

said box-p1ates, the pivot-shaft, the pawls, en- TIFFIN J. SHACKELFORD. gagiug with the toothed surface of said pivot- JOHN F. MILTONBERGER.

5 plates, the tripping-fingers, for disengaging Witnesses: l

said pawis, the rook-shaft, on which said in- JOHN D. WIDAMAN,

gers are mounted, and the spring, retaining HARVEY W. UPSON. 

